Below is a mirrored frame differencing program. And the pixels with changes will become red. I want to change the pixels (in red now) to become transparent. How to do it? Please help..


import processing.video.*;

int numPixels;
int[] previousFrame;
Capture video;


void setup() {
 size(320, 240);
 video = new Capture(this, width, height, 24);
 video.format = ARGB;
 numPixels = video.width * video.height;
 // Create an array to store the previously captured frame
 previousFrame = new int[numPixels];
 loadPixels();
 
}

void draw() {
 if (video.available()) {
   video.read();
   video.loadPixels();
   
   //Reversing x to mirror the image
    int index = 0;
 for (int y=0; y<video.height; y++) {
   for (int x=0; x<video.width; x++) {
     pixels[index + video.width - x - 1] = video.pixels[index + x];
   }
   index += video.width;
 }

 
   int movementSum = 0;
   for (int i = 0; i < numPixels; i++) {
     color currColor = pixels[i];
     color prevColor = previousFrame[i];
     
     int currR = (currColor >> 16) & 0xFF;
     int currG = (currColor >> 8) & 0xFF;
     int currB = currColor & 0xFF;
     
     int prevR = (prevColor >> 16) & 0xFF;
     int prevG = (prevColor >> 8) & 0xFF;
     int prevB = prevColor & 0xFF;

     int diffR = abs(currR - prevR);
     int diffG = abs(currG - prevG);
     int diffB = abs(currB - prevB);
   
     movementSum += diffR + diffG + diffB;
     
    // pixels[i] = color(diffR, diffG, diffB);
    pixels[i] = color(diffR, 0,0,100);

     previousFrame[i] = currColor;

 }

   if (movementSum > 0) {
     updatePixels();
     println(movementSum);
   }
 }
}